George s



(No Model.)

G. S. THOMPSON.

PLUG CHECK VALVE FOR BOILERS.

No. 592,501. Patented Oct. 26,1897.-

all

e d J ea, .2 J

UNITED STATES PATENT OFFICE.

GEORGE S. THOMPSON, OF NEW YORK, N. Y.

PLUG CHECK-VALVE FOR BOILERS.

SPECIFICATION forming part of Letters Patent No. 592,501, dated October26, 1897.

Application filed March 25, 1896. $erial No. 584,744. No modeLl To allwhom it may concern:

Be it known that I, GEORGE S. THOMPSON, a citizen of the United States,residing at the city of New York, in the county of New York and State ofNew York, have invented certain new and useful Improvements in PlugCheck- Valves for Boilers, of which the following is a specification.

My invention has relation to a combined plug and check-valve for use onlocomotive, traction-engine, and other boilers, and in such connectionit relates particularly to the construction and arrangement of such avalve.

The principal objects of my invention are, first, to provide a combinedplug and checkvalve of simple and durable construction, efficient inoperation, and having the plug mounted in a casing the bottom of whichis closed, and, second, to provide in such a valve a ball-check adaptedto rest upon a valve-seat formed within the plug.

My invention, stated in general terms, consists of a combined plug andcheck-valve constructed and arranged in substantially the mannerhereinafter described and claimed.

The nature and scope of my invention will be more fully understood fromthe following description, taken in connection with the accompanyingdrawings, forming part hereof, and in which- Figure 1 is a verticalsectional view of a combined plug and check-valve embodying the mainfeatures of my invention; and Fig. 2 is a top or plan view, partlybroken away to expose the stuffing-box of the valve.

Referring to the drawings, a represents a tubular valve-casing ofsubstantially conical shape, the lower end a of which is closed and theupper end a open. Leading to the casing a is an inlet a and leading fromthe casing is an outlet a. Vithin the casing a is located a tubularconical plug b, its lower closed end b normally engaging the wall of theeasing above the closed lower end a thereof, so as to compensate forwear of the same and to permit of the tightening thereof and thereby toprevent leakage of said plug during continual use. The interior of theplug bis provided with a valve-seat b and with the openings 11 and babove and below the seat b Then the plug 1) is turned in one direction,the opening 19 will register with the outlet (0, and the opening 5* willregister with the inlet a to permit of the flow of liquid through theplug and easing; but when the plug is turned in the casing in anopposite direction the flow of liquid through the plug and casing isstopped. The upper end of the hollow conical plug is sealed or closed bymeans of a cap (Z, screwthreaded to the interior thereof and havingformed on its upper end a square or polygonal projection 01, by means ofwhich the cap (1 may be screwed or unscrewed by the application ofawrench thereto. The tubular plug (Z is also provided near its upper endwith a ledge or shoulder 6, upon which the inner periphery of aclamping-ring f is adapted to rest. This ring f is screw-threaded to theupper end of the conical casing a, and between the ring f and easing ais mounted a packing f of asbestos or the like, the ring and packingforming thereby a stuffing-box in which the plug is adapted to turnwithout permitting of the leakage of liquid. ledge e is preferablylocated a washer (2. Upon the valve-seat b of the plug 1) is introduced,by preference, a ball h of metal, rubher, or similar material toconstitute a check in the passage of water through the plug. This ballit may be removed from the plug by simply unscrewing the cap d and theplug removed from the casing by unscrewing the ring f of thestuffing-box.

From the above description it will be understood that the ball It may beremoved from the interior of the plug 19 by unscrewing the cap (1 andwithout disturbing the ring f, packing f, or washer e, and that thepacking and washer may also be removed or repaired by simply unscrewingthe clampingring f and without removing the plug or ball. Having thusdescribed the nature and ob jects of my invention, what I claim as new,and desire to secure by Letters Patent, is The combination, in a plugcheck-valve, of the casing a, having a closed lower end a, and inlet andoutlet openings, a conical hollow plug 1), adapted to turn in saidcasing and having an opening in its upper end and openings in its walladapted to register with the openings in the casing, a screw-cap (1,adapted to normally close the upper end of said plug, a ball-valve h,adapted to be introduced through the opening in the upper Between thering f and ICO end of the plug and to seat'itself in the interior of theplug, a ledge e, formed. on the peri phery of the pl [1 g, a 01am ping-ring f, adapted to slip over the cap d and the upper end of the plugand to be screwed down on the easing a, toward the ledge e, a packing f,interposed between the casing and ring, and a Washer interposed betweenthe ledge e, and said ring, all arranged so that said ball-valve may beremoved from the interior of the p1u g without disturbing said packingand pack ing-ring and said packing may be removed without removing saidplug or ball-valve, substantially as described.

In testimony whereof I have hereunto set 15 my signature in the presenceof two subscribing witnesses.

GEO. S. THOMPSON.

WVitnesses:

J. WALTER DOUGLASS, RICHARD O. MAXWELL.

